Throw-off mechanism for presses



June 2, 1931. c. F. FRAUENBERGER 1,308,499

; THROW-OFF MECHANISM FOR PRESSES Filed May 8, 1928 4 Sheets-Sheet 1 IN VENT 0R "June 2, 1931. c. F. FRAUENBERGER ,303, 9

THROW-OFF- MECITIANISM FOR PRESSES Filed May 8. 1928 I 4 Sheets-Sheet 2 Q avwawtoz Ga! Kim/M v abhor mu am 5. ajzmw June 2, 1931. c. F. FRAUENBERGER Q 1,805,499

THROW-OFF MECHANISM FOR PRESSES Filed May 8, 1928 4 Sheets-Sheet 3 @uvemtoz 544/ fjaalw/fl w 33913 Qua/mu June 1931- c. F. FRAUENBERGER ,499

THROW-OFF MECHANISM FOR PRESSES Filed May 8. 1928 4 Sheets-Sheet 4 56022 g w vwmtoz Patented June 2, 1931 warren STAT-ES moans PATENT oFFicE CAR-L r. FRAUENBERGER, or FRANKLIN, MASSACHUSETTS, ASSIG1\TOR TO .rHoMsoN NATIGNAL rnnss'co. mo. A oonroanrronor DELAWARE a THROW-OFF MECHANISM IEBCEFSSES Application filed May 8, 1928. Serial No. 276,086.

.The object of my invention is to provide a generally improved novel throw off or tripping mechanism for use on cutters and creasing presses and like machines. One'object of the invention is to provide a throwofi mechanism adapted to be operated manually for the purpose of throwing the impression on and off whenever occasion demands it. Another object is to provide electrically actuated or controlled means for throwing ofi the impression and at the same time stop the press. Still other objects are to improve and refine the throw E mechanism so asto obtain simplicity of construction and eificiency, safety and sureness of operation. Accordinglymy invention is embodied in a throw off mechanism of the general type and char acter as hereinafter described and as illustrated in the. accompanying drawings in which Y V Fig. 1 is a side view of a cutting and creasing press equipped with a throw off mechanism embodying the invention, with details omitted and parts broken. away. f. i V j v Fig. 2 is an enlarged side view of the throw off mechanism with parts broken away.

Fig. 3 is a detail sectional view of parts of the mechanism.

Fig. 4: is a vertical elevation looking in'the direction ofarrow 4 in Figure 2.

Fig. 5Iis a plan view lookingin the direction of arrow 5 in Figure 2. i

Fig. 6 is a wiring diagram. Fig. 7 is a sectional detail view on line'77 of Figure 2. 1

The invention is disclosed in connection with a well known type of'ja heavy cutting and creasing press which comprises a frame 1 forming a stationary form member 2.; 3 is the platen which oscillates. or rocks on the frame beingoperated in a well known'man ner by connecting rods 4 driven by, a suitable operating mechanism not shown.

The platen is'carried on a shaft 5 journaled in eccentric sleeves 6 mounted in the ends of the connecting rods. Each sleeveis provided with a radially disposed arm 7 e and the two arms are. connected across the machine by an adjuster bar 8. Only one side of the press i s'shown. The platen has side frames 9 forming rockers 10 which rock or roll .on tracks 11 on the press frame. The impression of the platen on the form, which is not shown is regulated byrotating or adjusting the eccentric sleeves 6 in the connecting rods whereby to move the shaft 5 closer to or further away from the form in a well known manner. For this purpose the platen body is at'each side of the press provided with a number of,

teeth or notches 12 adapted to beengaged by a pawl 13' having a notch 14. f Thepawl is mounted in adjusted position on the teeth 12 by means of a bolt 15. The head of the bolt slides in an undercut groove 90 in the platen body, g- -j By loosening the bolt 15, th p 'may be moved circumferentially onthe platen body, hence the notch 14 may be ustedwith respect to the form of the press, I

see also Fig.1.

The adjuster bar 8 carries two latches 16 one at each end withina suitable bearing 19. Each .latch has a tooth 17 adapted to engage the "aforesaid notch 14 under pressure by' a eccentric sleeves are locked ina given position with respect to the platen body, The

adjustment is varied by adjusting the position of the pawl 1'3,1 in a well known manner. 7

,l/Vhenit. is desired to throw'off the impression, the latches 16 are disengaged from the notches 'lto permit the adjuster bar 8 with the eccentric sleeves to, fall bygravity. outwardly into the throw. oil position shown in full lines in: Fig. 1' and the shaft 5 will ac- 5 spring 18, whereby the adjuster bar and the ed in end bearingsQQ bolted to the ends of i thejadjuster bar 8 The shaft 21 carries a throw off lever 28 which is adapted to be engaged by a hook 36 which normally is not in the path ofjthe lever 28 but which hook is end of the impression stroke when it is desired to trip the press/ The operation is as follows. lVhen theplaten is'abou' toclose on the form, the hook 36'is moved to catch and -moved into the patli'ofthe lever 28, at the I arrest the upward and inwardmovement of the lever 28. The latter therefore" cannot con- .on arm 23 having bolts 24.;for adjusting its angular positionon shaft 21. --.The .arm'23 carries a roller 26 which may be placed in any 7 one of a number of holes in the arm. 7 The latter is adapted to be arrested in its outward movement, when the press opens, by an abut- .ment 33 ,wvhich normally is .not the ,path 1 oftheroller 26, but. .whiehabutment. is moved in t '0,"the, path thereofwhen the press is to-he int-ripped near the. endofthe openingstroke.

. he, thr ing-( 11 or; untripping operation is as. follows. When the platen is'nearthe end of the opening stroke, fthe abutment 33 will be movedintothepath oftheroller2fi. In due. time the .roller126.'will.run ontofthe abut- .ment, see the dotted OUtlinGiITFigi 2. ,Oon-

sequentlythe mass stopped and, rocks the sha ft21anti-clockwise while'the platen eonitin u'es xits outward m0vement,:thereby moving .thepawls 13in under.thelatehes l 6.-- ,When ,thenotches 14; are opposite the teeth;17 on the latche's, the latter will he forced inwardlin positions {the bearings 19. by :the. springs 18 ,.,a rid thus t e latches andzthe pawls .will engage I and the parts again locked in normahuntripped -The impresio n,therefore, is. thrown on, or

.the press is .untripped, by arresting. the 111 ment, of,.tl1e ,arm:23 ,and permit an anticlock- .wise movement of the shaft .21 to permitthe let-0.118s fiiem v n a nt en sei ient ivith the pawltnotches 14, whereby {to lock the adjuster. haifl8;to,the platen vin its former a djustedlposition. The roller'26 is mounted n any one ofthe holesI25 in a position'to correspond with the adjusted position. of.the

pawlli. Thatislto say, iflthepawl vl3 engages/the fourth tooth in theseries of teeth 12,.the roller 26will be mounted inthefourth hole 25, andso on. This is necessary inorder that the arm 23 be stopped in a predetermined posit-ion to accomplish the throwingon ofthe impression with theplaten in the position de termined bythe adjusted position of .the

' PEI-W131i; ontheplaten body- Theabutment 33 and thehook 36.are bot carried by a tripping lever 30.pivotedat 31 to.a bracket 32 isecured to the press. The lever 30, see Figure 4,.extends upwardly from .the pivot 3land has a short arm to which the abutment 33 ispivoted at 34 and rests on a spring 35. The hook 36 is pivoted on a longer upright arm 42 of .the lever 30 andis operated by means tobe explained hereafter. The tripping lever is swungto the left in Figure @150 bring the abutment 33 into the path of the roller 26 to arrest the movement of the arm 23 to throw on the impression. The tripping lever is swung to the right in Figure 4 to cause the hook 36 to engage the throw off arm 28 to rock the shaft 21 to throw off, the impression. V The swinging movement of the tripping lever 30 is accomplished by means of a foot bar 37. Normally the lever 30 is locked in upright neutral position by a spring 3 9.whieh lies one half. in. the lever and one half in the bracket 32, see Figure 2.

During the normal operation of the press the impression is on and the arm 23 occupies a position relative to the platen such as is indicated in dotted'lines in Figure 1. The pa- .per,.,after being cutand creased, is. removed from the press; by ,lsuitable nipper'sl3 which are: carried. byswinging .arms 44;. pivoted on a shafttSQ As thepress closes, tllflllhQPQlSAB descend and grip. the upperedge of thesheet. As the press. opens, the nippers are .raised nnd carry thesheetaway to be disposed of by a suitable delivery mechanism, not shown.

.Ifthere is a, faulty sheet onthe platen,the

nipperswill be unable to ren'iove it.and the .press .must therefore .be tripped before it "closes. The operator,therefore, puts his foot under thebar 37fltotilt the tripping leverto 3 the rightin Figure ,and thus:brings;the

book 36 inoveig or into path of the throw .Oftarm 28. .The ;hook. engages the arm the shaft 21 will be rocked clockwise, the latches disengaged fromthe pawls .13 and at the close of the impression stroke, theadjuster bar and shaft 21 with associated parts ;fall

clockwise intothe positionshownin full lines inFi gures 1 and 2 ;and the press tripped or the mpresion thrown. ,off. v the, succeeding closing stroke t he throw.o ff.,arm,28 will p'ass by the. hook 3 6, an dfthe, press. will continue to run with the .impizessionofit, it ,may be s ep edr After the trouble hasbeen attended to, the impression is thrown on. This ,is accomplished by the operator; placingzhis foot .on tgpof the bar 37 .therebytiltingthe tripping le ver to the left in Figure 4 so asto bring the abutment 33 in underlorlinto thepath of the deseending rolleriifi. When thelatter contacts with the abutment, the movement of thearm23 is'. arrested and as, explained above, .thedatches lti re-engage the notches ,14 torestore. t 11e normal runningposition of the-adjuster-'bar'28and .the sleeyes 6 and the impression .is ,again ,on. The swinging movements .of the E's-ripping: lever 30- are glimited and regulated by the twofls crews 38 carried by the ,bracketj 32 andadaptedto engagethe centering pinflfi fast in,the lever 30. r

The.impre ssion .n ay'also be thrown ofi? automatically and gthe lmachine stopped. Thisis, ofadvantage vWhere the operation is such that. theioperator temporarily absent -flOI t e llf fil hi i 'e s i lpi dstopping the motor 50, Figure 6, which drives the machine, and also for operating the hook 36 to engage the throw off arm 28 on the closing movement of the machine.

Referring first to Figure 4:, however, it will be seen that the hook 36 is pivoted to the tripping lever at 51. A spring 52 tends to pull the hook into active outward tilted position in the path of the throw off arm 28. This tendency is opposed by a release magnet 53 which maintains an armature 5A in upright attracted position overcoming the force of the spring 52. The hook is connected to the armature by a link 55.

Referring now to Figure 6, it will be seen that there is provided a starting circuit from the line 56 through wires 57, 58 and 59 to a switch magnet 60, thence through wire 61 to the other line 62. This circuit is broken at the starting push button switch 63. When the latter is pushed in, the starting circuit is closed and the magnet 60 operates switch arm 64 to close the operating motor circuit from line 56, through wire 65, switch arm 6% and through the motor to line 62. At the same time another circuit is closed through the magnet 60 as follows. Line 56, wire 65, switch arm 64, wire 66, to wire 58, to wire 59, through magnet 60, to wire 61 to line 62. Thus, even though the pressure is taken oif the starting button 63 and the starting circuit opened, the magnet 60 will remain energized and the operating circuit through the motor remains closed.

The press commences then to operate and is usually turned over a couple of times, the impression being off, because there is no current in the impression release magnet 53, one side-through wire 67, being open at 63. The operator then puts his foot on the bar 37 to swing the tripping lever into position to put the impression on and also releases the starting button 63. The release of the starting button switch closes the release circuit through release magnet 53 as follows. From position. The paper may now be fed to the press and the normal operation is on.

If it is now desired to put the circuit into tripping condition, the operator pushes another tripping push button switch 68 and closes a circuit as follows. From line 56 through wires 65 and 66 to push button 68, to magnet 69 through wire 70 to line 62. The magnet 69 then pulls up its core and closes two switches 71 and 72. Current then passes through the magnet from wire 66 through switch 71 and back hrough 70 to line 62. Consequently the magnet- 69 remains energized even though the trip push button switch 68 is released. 3

At the same time, however, a stop circuit has been closed through the nippers 43 from a local battery 74 through the nippers, wire 75 to a switch 76, through switch 72, wire .77 to stop magnet 78 and back through wire 7 9 to the'battery, provided there is no paper between the nippers. In this event, the magnet 7 8 being energized, it will open the operating circuit in line 59 and the motor will stop. If there is paper between the nippers, the automatic stop circuit through magnet,, 78 will be open and the operating circuit through magnet 60 remains closed and the press will continue to operate.

The switch 7 6 is arranged to momentarily open the stop circuit through the nippers when the latter are in the position shown in Figure 1 ready to grip the paper. At this time it is not desirable that the nippers are in a live circuit. The rocking shaft 45 which carries the nipper arms 44 also carries a" swinging cam member 80 adapted to engage the switch 76. As the nippers descend to take the paper, the cam 80 opens the switch 7 6 and keeps it open until the nippers have M, ascended clear of? the press. If now the nippers have seized a sheet, the circuit through stop magnet 7 8 will remain open. v If the nippers do not seize a sheet, this circuit will be closed and the magnet 78"will open theoperating circuit of'the press. 'l 6 The press maybe stopped atanytime by pressing the stop button switch. 81 tolbreak the operating circuit. The'three buttons'63,

68 and 81 maybe located conveniently within reach such as indicated in Figure 1. "f

In operation the roller 26 is positioned in the arm 23 to correspond with the adjustment of the pawl 13 so as toobtain the impression adjustment and pressure desired. The press is thenfstarted by pressing the starting but- 05 ton 63 which closes the motor operating circuit through magnet 60. At this time the impression is off. The operator then swings the tripping lever to bring abutment 33 into the path of the roller 26, thus throwing the 1 impression on at the same time releasing the starting button. This automatically closes the tripping circuit through the release magnet 53, the armature 541 is attracted and keeps the hook 36 out of the path of the throw off 1' 5 lever 28. I

If the nippers fail'to seize a sheet, the stop circuit through the magnet 60 is opened and the release magnet 53 no longer holds the hook 36 in inactive position. The hook is pulled out into the path of the lever 28 and engages the latter to automatically throw off the impression because the platen is moving on its closing or upstroke, and atthe same time the press-stops.

From the foregoing it will be clear that the operator may at any time throw the impression on and oil b o aeratin the tri in 1. b I;

lever 30, besides which the throw off mechanism may be automatically and electrically "1'30 operated. by merely closing thetripping .circuit through a the impression release .magnet The throiv off mechanism as herein described may beattached to the press With- OIHZ'IGCIHlIJlH any material alteration in the press structure. It is safe and easy to operate and responds both to manual .as wellwaselectrical. operation Whenever circumstances rel quire.

' I claim i i 1.In arplatenpress, means to. adjust .the impression of tlieplaten, a shaft to unlock the adjusting -means to throw oil' the im- 1 pression, two lovers on said shaft, atripping lever adapted to be moved into the path-of either one of said levers to actuate the said shaft and means for operatingsaid tripping lever. 2.- The combination of a ,platen press, meansfor adjusting the position of the platen therein, means for operating said adjusting means to throw oli the impression of -vthe platen, an electrically controlled member for 2 actuating said operatingmeans, an electrical circuit for operating said press and including the saidmember andmeans in said circuit for automatically causing said member .to :act and to stop the said press. 3. In combination, a platen;press,.means for adjusting the impression of the platen, mechanism forthrowing the impression on y and off, a tripping lever, means for manually operating said tripping leverto actuatethe 33 said niechanism, an electrical press operating circuit, means in said circuit for-automatically causing said tripping lever to actuate said mechanism to throw'oii the impression and 7 means in said circuit for automaticallybreak- 4 ingthe same to stop the press when the impression has been thrown 01f.

CAR-L F. FRAUENBERGER. 

